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CSS

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HTML 

              
                <nav class="wrapper">
  <ul class="menu">
    <li class="nav-item"><a href="#">Home</a></li>
    <li class="nav-item"><a href="#">About</a></li>
    
    <li class="nav-item dropdown"><a href="#">Portfolio</a> 
             <ul class="sub-menu">
               <li class="nav-item"><a href="#">Portfolio 1 Column</a></li>
               <li class="nav-item"><a href="#">Portfolio 2 Column</a></li>
               <li class="nav-item"><a href="#">Portfolio 3 Column</a></li>
           </ul>
    </li>
  
    <li class="nav-item dropdown"><a href="#">Services</a>
      <ul class="sub-menu">
        <li class="nav-item"><a href="#">Service 1</a></li>
        <li class="nav-item"><a href="#">Service 2</a></li>
        <li class="nav-item"><a href="#">Service 3</a></li>
      </ul>
    </li>    
    <li class="nav-item"><a href="#">Contacts</a></li>
    <li class="nav-item"><a href="#">Articles</a></li>
  </ul>
</nav>
<main class="wrapper">
  <h1>Article Header</h1>
  <p>Lorem ipsum, dolor sit amet consectetur adipisicing elit. Accusamus voluptas delectus molestiae, hic ratione molestias, cupiditate ducimus blanditiis, possimus aut ad id. Molestias nesciunt vel delectus numquam, non porro id?</p>
  <p>Iste ullam quos mollitia quas quo voluptates beatae omnis deleniti quisquam blanditiis, asperiores vitae aut delectus, doloremque incidunt sed obcaecati esse exercitationem eum perferendis ratione? Quos tempore sequi dolor sit.</p>
  <p>Hic quidem voluptatibus temporibus laudantium sed non, magni fugit nobis obcaecati quod placeat unde in? Repellat ipsam inventore natus quidem officia nam. Provident eum tenetur molestiae excepturi? Obcaecati, maiores voluptates!</p>
  <p>Pariatur repudiandae fuga eum provident tempora similique. Temporibus voluptates harum, dignissimos iusto unde quis nihil perspiciatis, doloremque beatae sunt quo voluptatem quidem commodi ex, explicabo voluptate quaerat repudiandae atque iste!</p>
  <p>Recusandae architecto ab natus rem aliquam. Velit asperiores illum aliquam et modi excepturi eaque. Asperiores placeat totam repellat, voluptatem consectetur officiis vel. Possimus illum nulla architecto tempora voluptas, sed soluta?</p>
  <p>Iure atque autem tempore porro odit repellat labore cupiditate voluptas provident odio. Vero unde voluptate tenetur facere, distinctio eos voluptatum esse nobis illo veniam perspiciatis eum aliquid aut, voluptates ipsa?</p>
  <p>Quod porro consectetur, ab nesciunt praesentium alias amet accusantium, architecto blanditiis veritatis accusamus pariatur nobis. Delectus soluta aut amet rerum eius quidem labore error suscipit. Quia sit fugiat distinctio qui.</p>
  <p>Eaque eius provident porro iusto iste? Doloremque pariatur doloribus culpa eos quibusdam sed asperiores dignissimos magni voluptate nulla ratione corrupti maiores, magnam placeat dicta cumque quaerat at totam cupiditate veritatis!</p>
  <p>Maiores quo dolore nisi molestiae fuga sapiente voluptatum, doloremque illo quod laudantium harum debitis odit fugiat delectus repellendus quae earum nostrum obcaecati nam tempora expedita eaque. Quod autem voluptatum odit.</p>
  <p>Nulla commodi voluptatum perspiciatis magnam quaerat sint, et, consectetur culpa nesciunt est quis, hic molestiae tempora laudantium asperiores dolor alias recusandae dicta iste dolorem laboriosam! Quaerat quos sint et. Non.</p>
  <p>Iusto, nesciunt! Nam necessitatibus eos modi dolor explicabo ratione, recusandae nisi eligendi ut, reiciendis id unde repudiandae nemo, sequi iure dolorum architecto voluptate? Reprehenderit eum nemo minus culpa nostrum quibusdam?</p>
  <p>Earum pariatur, nam a, aspernatur saepe, ad commodi ex cumque sapiente sed exercitationem. Esse reiciendis, possimus voluptatibus quos amet libero magnam eligendi ullam excepturi nam optio placeat ipsam soluta nesciunt?</p>
</main>
!

CSS 

              
                *{
  box-sizing: border-box;
}
body {
  font-family: sans-serif;
}
.wrapper {
  max-width: 630px;
  margin: auto;
}
.menu{
  font-size: 0; 
}
nav ul {
  margin: 0;
  padding: 0;
}
.nav-item {
  display: inline-block;
  cursor: pointer;
  padding: 14px 20px;
  background: #000;
  color: #fff;
  font-size: 18px;
  border-right:1px solid #ccc; 
}

.nav-item:last-child {
  border-right: 0;
}

.nav-item:hover{
  background: #555;
}
.nav-item a{
  color: #fff;
  text-decoration: none;
}
.sub-menu{
  display: none;
  position: absolute;
  left: 0;
  top: 100%;
  width: 200px;
  padding-top: 20px; 
}
.sub-menu > .nav-item {
  border-top:1px solid #ccc;
}

.dropdown{
  position: relative;
}
.dropdown:hover > .sub-menu{
  display: block;
}
!

JS
!
999px

Console